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| Study on slurry diffusion law in goaf under different grouting pressure |
| Cheng Lichao1,2,3, Lu Bin1, Li Xinwang1,2,3, Hao Yunde1, Long Hang1, Wang Haixuan1 |
| 1. School of Mining Geomatics Engineering, Hebei University of Engineering, Handan 056038, China;
2. Coal Resources Development and Construction Application Technology Research Center of Universities in Hebei Province, Hebei University of Engineering, Handan 056038, China; 3. Handan Coal-based Solid Waste Scale Utilization Technology Innovation Center, Hebei University of Engineering, Handan 056038, China |
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Abstract In order to study the law of slurry migration and diffusion in the complex space of goaf, the cement fly ash slurry was taken as the research object. By analyzing the rheological properties and flow characteristics of the slurry, the time-varying equation of viscosity was determined. The finite element numerical simulation method was used to establish the grouting diffusion model of cement fly ash slurry in goaf, and the diffusion range of grouting slurry at different times was obtained. The relationship between grouting diffusion radius and grouting pressure was studied. The results showed that the cement fly ash slurry belongs to the Bingham fluid. In the grouting process, its viscosity gradually increased with time, and the slurry flow velocity decreased. The diffusion form of cement fly ash slurry in the gangue pile in the goaf initially changed from sphere to cylinder. The diffusion radius of slurry increased with the increase of grouting time, and the change rate decreased with the increase of slurry viscosity. The diffusion radius of slurry reached 10.49 m at 10 h. The change of grouting pressure had a strong influence on the slurry diffusion speed. When the grouting pressure was 0.2MPa, the slurry diffusion distance was 10.01 m.When the grouting pressure was 0.5MPa, the slurry diffusion distance was 14.51 m.Whenthe grouting pressure was 1MPa, the slurry diffusion distance was 18.96m. It was concluded that the smaller pressure could be provided in the early stage of grouting, and the grouting pressure could be appropriately increased to improve the grouting efficiency. This study provided a theoretical basis for improving and optimizing the grouting process in goaf.
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| [ 1 ] 刘建功，李新旺，何 团. 我国煤矿充填开采应用现状与发展[ J ]. 煤炭学报，2020，45（ 1 ）：141 - 150.
[ 2 ] 王金华，康红普，刘见中，等.我国绿色煤炭资源开发布局战略研究[ J ]. 中国矿业大学学报，2018，47（ 1 ）：15 - 20.
[ 3 ] 钱鸣高，许家林，王家臣. 再论煤炭的科学开采[ J ]. 煤炭学报，2018，43（ 1 ）：1 - 13.
[ 4 ] 杨志全，侯克鹏，郭婷婷，等. 基于考虑时变性的宾汉姆流体的渗透注浆机理研究[ J ]. 四川大学学报（工程科学版），2011，43（ S1 ）：67 - 72.
[ 5 ] 阮文军. 注浆扩散与浆液若干基本性能研究[ J ]. 岩土工程学报，2005（ 1 ）：69 - 73.
[ 6 ] 李术才，刘人太，张庆松，等. 基于黏度时变性的水泥–玻璃浆液扩散机制研究[ J ]. 岩石力学与工程学报，2013，32（ 12 ）：2 415 - 2 421.
[ 7 ] 黄河飞. 基于COMSOL的注浆渗透扩散规律数值研究[ J ]. 科技资讯，2015，13（ 14 ）：250.
[ 8 ] 尚宏波，靳德武，柳昭星，等. 地下含水层帷幕注浆单液水泥浆扩散规律研究[ J ]. 煤炭科学技术，2021，49（ 11 ）：134 - 141.
[ 9 ] 刘 洋，覃祥瑞，张慧梅，等. 岩体粗糙裂隙中浆液扩散规律研究[ J ]. 煤炭技术，2022，41（ 3 ）：120 - 123.
[ 10 ] 钱自卫，姜振泉，曹丽文. 渗透注浆浆液扩散半径计算方法研究及应用[ J ]. 工业建筑，2012，42（ 7 ）：100 - 104.
[ 11 ] 张宏图，李 阳，姚邦华，等. 瓦斯抽采钻孔封孔水泥砂浆黏度时变性扩散模型[ J ]. 煤炭科学技术，2020，48（ 10 ）：52 - 59.
[ 12 ] 王庆磊，朱永全，李文江，等. 考虑黏度空间衰减的宾汉姆流体柱形渗透注浆机制研究[ J ]. 岩石力学与工程学报，2022，41（ 8 ）：1 647 - 1 658.
[ 13 ] MAGHOUS S, SAADA Z, DORMIEUX L， et al. A model for in situ grouting with account for particle filtration[ J ]. Computers and Geotechnics, 2007, 34( 3 ): 164 - 174.
[ 14 ] 杨文才. 基于浆液自重的多孔介质渗透注浆机制研究[ D ]. 昆明：昆明理工大学，2020.
[ 15 ] 朱明听. 单一裂隙注浆扩散及封堵机理的数值模拟研究[ D ].青岛：山东大学，2013.
[ 16 ] 路 乔，杨智超，杨志全，等.考虑扩散路径的宾汉姆流体渗透注浆机制[ J ].岩土力学，2022，43（ 2 ）：385 - 394.
[ 17 ] 杨志全，卢 杰，王 渊，等.考虑多孔介质迂回曲折效应的幂律流体柱形渗透注浆机制[ J ].岩石力学与工程学报，2021，40（ 2 ）：410 - 418.
[ 18 ] 周军霞，陆劲松，张 玉，等.考虑浆液粘时变性渗透注浆理论计算公式[ J ].材料科学与工程学报，2019，37（ 5 ）:758 - 762.
[ 19 ] 朱明听，张庆松，李术才，等.土体劈裂注浆加固主控因素模拟试验[ J ].浙江大学学报（ 工学版 ），2018，52（ 11 ）：2 058 - 2 067.
[ 20 ] 白仲荣.采空区内浆料堆积规律试验研究[ D ].北京：煤炭科学研究总院，2016.
[ 21 ] 邹友平.煤矿采空区高掺量粉煤灰注浆扩散机理及应用[ D ].北京：煤炭科学研究总院，2016.
[ 22 ] 王青松.南水北调工程采空区注浆数值模拟研究[ D ].天津：天津大学，2014.
[ 23 ] 冯 涛.南水北调中线工程采空区注浆处理试验研究[ J ].人民黄河，2012，34（ 8 ）：131 - 133. |
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